Insulator



L. STEINBERGER.

INSULATOR.

APPLICATION FILED JAN. 17. 191 8.

1,403,717. Patented Jan. 17, 1922.

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mllefuuw 1 INVENTOR LL. Am) 5r L. STEINBERGER.

INSULATOR.

APPLlCATlON HLED JAN. U, IBIB.

1,403,717, Patented Jan. 17,1922.

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J I f INVENTOR A; man y UNITED STATE S PATENT OFFICE.

LOUIS STEINBERGER, OF BROOKLYN, NEW YORK.

INSULATOB.

To all whom it may concern:

Be it known that 1, Louis STEINBERGER, a citizen of the United States,and a resident of the borough of Brooklyn, county of Kings, State of,New York, have invented certain new and useful Improvements inInsulators, of which the following is a specification.

invention relates to insulators for use either as strain insulators oras suspension insulators, in which the strain members are provided withcompression surfaces or discs, the said compression surfaces or discsbeing situated opposite to each other and embedded in the insulatingmaterial.

One of the objects of my invention is to provide opposing discs for thecompression surfaces of the respective strain members for the purpose ofdisposing more of the insulating material between those faces than couldpossibly be disposed between the strain members of ordinaryconstruction.

Another object is to provide an insulator with improved strain memberswhich will stand up more effectually under greater mechanical stressthan will an insulator which is provided with strain members of ordinarystructure, and which improved strain members will at the same time actas distributing elements for the electrical stresses, and thus tend toprolong the life of the insulator.

Other objects will appear from the following specification and claims.

' Referring to the drawings in whichsimilar reference characters referto like parts the various figures;

Fig. 1' is a view partly section and it partly in side elevation of aninsulator embodying my invention.

Fig. 2 is a side elevation of the insulator f shown in Fig. 1, viewed ata point 90 there from. 1

[-Fig. 3, is a section on line 33 of Fig. 1.

Fig.- 3 is asection on line 3 "3 of Fig. 1.-

Fig. 4 is a view partly in elevation and partly in section of a modifiedform of my I invention.

Fig-5 is a View in elevation of one of the strain members used in theconstruction fshown inFig. 4.

Fig. 6 is a section on line 66 of Fig.4.

Figs. 8, 9 and 10 are details in horizontal cross section of the discsupporting shanksff 24 of the strain members.

Specification of Letters Patent. Patented Jan, 17, 1922, Applicationfiled January 17, 1918. Serial No. 212,337. 2

1 and 2 is distinguished primarily from that shown in Fig. 4 in'theparticular form of strain member used, the strain member of theconstruction shown in Fig. 4 being approximately onehalf of the strainmember shown in Fig. 1, and provided'with an open theother as shown, andportions of each are embedded in an insulating body E, the strain member10 being formed of an integral piece of metal and the strain member 11being formed of two U shaped portions 12 and 13, the free ends 14 ofeach being screw threaded at 15 and secured toeach other by nuts 16 and16 engaging with the screw threads, as clearly shown in Fig. 1.

The respective strain members are provided with circular plates or discs20 and 21 having shanks 22 and 23 extending-from one side. thereof,thesaid shanks being constructed to be secured to the bridge portions Tothis end the disc 20 is providedwith a shank 22 having screw threads atthe outer end thereof which engage with a screw threaded cavity 26 inthebridge 27 of the integral strain member, and the disc 21 is providedwith a shank 25 which fits into a'cavity 28 in the bridge portion of oneof the strain member 11. r

The shank 25 of the disc 21 is provided with a tenon 29 extendingtherefrom, screw threaded at its outer end at 29 for engagement with asecuring nut 29 as shown. The shank portion25 is keyed to the bridgemember as shown at 31 to prevent it turning around and thus causingshort circuiting between the strain members. 1

Many other suitable well known means may be provided for preventing theturning of the strain member on the shank of the parts constituting thedlSC. Fig. 7 is a detail view in vertical section.

In the embodiment of the invention shown in Figs. .4 to 6, theoppositely disposed circular plates or discs 40 and 41 are secured tothe horizontally projecting arms 42 of the strain members 10' and 11,each plate being secured to its respective arm in the'sa-me way, so thatthe parts constituting the strain members and the discs are duplicatesof each other. This "duplication of parts assists materially in thesaving of cost 'jacent hook of another strain member, thereby connectingone: insulator with its adjoining insulator. The construction is alsosuch that the parts may be readily disconnected.

The ShQILkSjQ/Ql are constructed with a ,pro-

, jectingtenon r lopro vided at the ends with screw threads 47 forengagement with nuts lockingistrain members in combination with a. bodyof insulating material having mold; ed therein oppositely disposed discsof: metal, ashank extending respectively from V each disc and projectingbeyond the body of insulating material, means on each shank'todetachably and removably secure the same 48 andowashe'rs 49 as clearlyshown in the drawings, so that the tenons -may pass through holes 50made for that purpose in the horizontally projectingportions of thestraininembers, and

the nuts and washers V V be secured thereto 7 by Suitable keys 51 areused' as shown to [prevent the discs from'turning around on theiraxes,and thus prevent short circuit ng betweenlthe strain members. 7

Another means which is, available; for

securing the discs. to the horizontalpo-rtion o'fthe strain member-andfrom preventing the d scs from turningon the axes of the r shanks 1sshown n Fig. 7. As there shown,

the shank is lprovidedvwith a tenon 61 having screw threads 62 on itsouter surface engaging with thescrew threaded hole 63 in the horizontalportion 64' of the strain member 11. 7' A small screw 65 issecured inplace ,assho-wn in-the screw hole copra. vided for that purposeat thejunction of the two screw threaded sunfaces These shanks to whi h the"discs oricircular plates are secured maybe made. square in horizontalcross section," or any other shape not round, or they may bemaderound 1with'a projecting ridge .7 0, or with a depression '71 3 for anchoringin the insulating material, to prevent turning, as indlcated n thevhorizontal cross-sectional views ;Eigs. ;8, 9

'pens e' with the use of keys.

and 10,.which constructionswhen used .dis-

. Extending from the shank portions here-- finabove described,areintegral fianges 75, 76, .76, which abutthe respective ends of theinsulating bodies, thereby protecting the insulating bodies from thebridge portions of the strain: members and rend'eringthe insulatingbodies less likely to become broken or chipped in use.

As willwbe seen,the discsand plates form compression surfaces for thestrain members and they are olfsuch area'that when they r of insulatingmaterial is situated between the strain member. a

struction, the insulator will resist great electricaland mechanicalstress and the elec- V trical stressesewill be distributed to" a largevdegree. The disc or plate construction will dispose 'the electro staticstress over a com- ,parativlely large area of insulating material andthereby reduceits concentration and thus increase the life and value ofany given insulator for certain voltages. Y

, As changes of construction'could be made within the scope of myinvention, it is intended that all matter contained in the abovedescription shall be interpreted as illustra- 7 tive and not in alimiting sense.

Having now described my invention, what I clalm as new anddesi're tosecurebyLet .ters Patent is 1. In a device of the kind'described,interto its respective strain member. j

insulating body, separate means for detach ably and removably secur ngeach shankto its respective strain member, and means for preventing astrain member from turn ng.

3. In a 'device' of the kind describedfla 7 body of insulating materialinterlocking strain 7 members, oppositely disposed metallic discs insaidlbody, each disc being provided with means for detachably and remov-4. In a device of I body of insulating material, interlocking the kinddescribed, 7 V

ably securing the same to itsrespective strain members, oppositelydisposedlco a vpression discs molded in said insulating body,a slngleshank projecting-irom each disc and extending outside'of thebody of r ainsulating material, means on each shank connecting with means on eachstraingmemher for detachably and removablysecuring each .shankto itscorrespond n strain memr.

ber. r 5. In a device of the kind described, interlocking strainmembers, a body of insulating material having oppositely disposedelectrical stress distributing"elements and having V [6 In a deviceofthe kind described, inter- V V I locking strain n embers',, abodyofinsulating' surfaces of the discs or plates. By this con- 7material, oppositely disposed stress disportions thereofv proj ectingaxially from the insulating body, separate means for-secure ving eachelectrical stress distributing-memv ber to itsrespectivestrain member."

1 are embedded in the insulator E va large body 7. i

tributing discs molded therein, a shank conmy hand at the borough ofManhattan, city nected to each disc, a portion of each of and State ofNew York, this fifteenth day 10 Whnih extends outwardly from thieboldlybof of January, 1918. insu ating material, means for etao a y andremovably securing each shank to its LOUIS STEINBERGER' strain member,and means for preventing In presence of each strain member from turning.C. C. BILLINGS,

In witness whereof, I have hereunto set ZITA M. GRAHAM.

